.\" -*- nroff -*-
.\" Copyright (c) 2010-2014 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines
.\" Copyright (c) 2020      Google, LLC. All rights reserved.
.\" $COPYRIGHT$
.TH MPI_Type_delete_attr 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.SH NAME
\fBMPI_Type_delete_attr\fP \- Deletes a datatype-caching attribute value associated with a key.

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Type_delete_attr(MPI_Datatype \fItype\fP, int \fItype_keyval\fP)

.fi
.SH Fortran Syntax
.nf
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_TYPE_DELETE_ATTR(\fITYPE, TYPE_KEYVAL, IERROR\fP)
	INTEGER	\fITYPE, TYPE_KEYVAL, IERROR \fP

.fi
.SH Fortran 2008 Syntax
.nf
USE mpi_f08
MPI_Type_delete_attr(\fIdatatype\fP, \fItype_keyval\fP, \fIierror\fP)
	TYPE(MPI_Datatype), INTENT(IN) :: \fIdatatype\fP
	INTEGER, INTENT(IN) :: \fItype_keyval\fP
	INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\fP

.fi
.SH INPUT/OUTPUT PARAMETER
.ft R
.TP 1i
type
Data type from which the attribute is deleted (handle).n

.SH INPUT PARAMETER
.ft R
.TP 1i
type_keyval
Key value (integer).

.SH OUTPUT PARAMETER
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer).

.SH DESCRIPTION
.ft R
MPI_Type_delete_attr deletes a datatype-caching attribute value associated with a key. This routines partially replaces MPI_Attr_delete, which is now deprecated.


.SH NOTES
Note that it is not defined by the MPI standard what happens if the
delete_fn callback invokes other MPI functions.  In Open MPI, it is
not valid for delete_fn callbacks (or any of their children) to add or
delete attributes on the same object on which the delete_fn callback
is being invoked.


.SH ERRORS
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.
.sp
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

